#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>

int main()
{
	int n = 0;
	scanf("%d", &n);
	int count = 0;
	while (n)
	{
		if (n % 2 == 1)
			count++;
		n = n / 2;
	}
	printf("%d", count);
	return 0;
}